Home / 20,987.40-28,963.93-11,555.97

Finding the Fourth Proportional to 20,987.40, 28,963.93 and 11,555.97

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Solution

The fourth proportional to 20,987.40, 28,963.93 and 11,555.97 is: 15,947.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.40 : 28,963.93 = 11,555.97 : x
  2. Step 2: Convert to fraction form
    20,987.40/28,963.93 = 11,555.97/x
  3. Step 3: Cross multiply
    20,987.40x = 28,963.93 × 11,555.97
  4. Step 4: Simplify right side
    20,987.40x = 334,706,190.32
  5. Step 5: Solve for x
    x = 334,706,190.32/20,987.40
  6. Step 6: Final answer
    x = 15,947.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.